Objects in the image:
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: airplane
category: person

Guessing-game dialogue about one of the objects:
q: is it a person?
a: Yes
q: are they in the front group going down the stairs?
a: No
q: are they in the back group going down the stairs?
a: Yes
q: is it the first person at the top of the stairs?
a: Yes